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rocknpilot(at)hotmail.com
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 Posted: Wed Aug 29, 2018 1:13 pm Post subject: Yak Air Valves |
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Greetings, Aviators and Aviatrixes!
As I continue my (endless) pursuits in identifying and rectifying my emergency air leak, about the only items remaining untouched are the master air valves. After liberating the front valve, I managed to open it up - despite it's best impressive efforts to remain intact. The only fix I can envision is lapping / re-seating the needle valve. My question is: Is it common for these to lose their sealing ability? It would seem to reason that they are used so little, (and built so robustly) that they shouldn't EVER wear out. Or is it because they're rarely used that they begin to loosen up? Am I missing part of the picture here? I don't see any seals or anything else that may be the issue...but despite no audible leak, emergency air is totally depleted within several hours. I replaced the bottle and sealed it TIGHTLY. The check-valve between the external fill point and the bottle checks out. Main air integrity is flawless.
Any ideas / guidance would be mucho appreciato!
Many thanx!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 // Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
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hkgibby(at)yahoo.com
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| Posted: Wed Aug 29, 2018 1:32 pm Post subject: Yak Air Valves |
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Rico- suggest you remove old Emer and Main valves with new SS valves from Swagelok. Procedure attached.
Hoot
Sent from my iPhone
On Aug 29, 2018, at 5:01 PM, Rico Jaeger <rocknpilot(at)hotmail.com (rocknpilot(at)hotmail.com)> wrote:
| Quote: |
Greetings, Aviators and Aviatrixes!
As I continue my (endless) pursuits in identifying and rectifying my emergency air leak, about the only items remaining untouched are the master air valves. After liberating the front valve, I managed to open it up - despite it's best impressive efforts to remain intact. The only fix I can envision is lapping / re-seating the needle valve. My question is: Is it common for these to lose their sealing ability? It would seem to reason that they are used so little, (and built so robustly) that they shouldn't EVER wear out. Or is it because they're rarely used that they begin to loosen up? Am I missing part of the picture here? I don't see any seals or anything else that may be the issue...but despite no audible leak, emergency air is totally depleted within several hours. I replaced the bottle and sealed it TIGHTLY. The check-valve between the external fill point and the bottle checks out. Main air integrity is flawless.
Any ideas / guidance would be mucho appreciato!
Many thanx!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 // Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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CJ_Air_Valve_MOD_Jason_Berman.docx |
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jonboede(at)hotmail.com
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| Posted: Wed Aug 29, 2018 1:43 pm Post subject: Yak Air Valves |
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Frequently get inter-granular corrosion in the valve needles and they fail slowly over time.
The steel they used for the needles wasn’t always the best quality.
On Aug 29, 2018, at 4:26 PM, Rico Jaeger <rocknpilot(at)hotmail.com (rocknpilot(at)hotmail.com)> wrote:
| Quote: |
Greetings, Aviators and Aviatrixes!
As I continue my (endless) pursuits in identifying and rectifying my emergency air leak, about the only items remaining untouched are the master air valves. After liberating the front valve, I managed to open it up - despite it's best impressive efforts to remain intact. The only fix I can envision is lapping / re-seating the needle valve. My question is: Is it common for these to lose their sealing ability? It would seem to reason that they are used so little, (and built so robustly) that they shouldn't EVER wear out. Or is it because they're rarely used that they begin to loosen up? Am I missing part of the picture here? I don't see any seals or anything else that may be the issue...but despite no audible leak, emergency air is totally depleted within several hours. I replaced the bottle and sealed it TIGHTLY. The check-valve between the external fill point and the bottle checks out. Main air integrity is flawless.
Any ideas / guidance would be mucho appreciato!
Many thanx!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 // Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
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| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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LawnDart
Joined: 05 Jun 2006
Posts: 64
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| Posted: Wed Aug 29, 2018 2:17 pm Post subject: Re: Yak Air Valves |
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In almost 20 years, the only leaks I have had on the emergency side were at the emergency valves in the cockpits. There is a square o-ring, #6 in the attachment; this has always been the offender.
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Vic
Joined: 12 Aug 2008
Posts: 115
Location: Southern Bavaria
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| Posted: Wed Aug 29, 2018 4:09 pm Post subject: Re: Yak Air Valves |
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Hi Rico,
how did you check for leaks, with soapy water foam ? Did you check the hose to the pressure indicator plus this instrument itself ? We had same problem on the 18 T but in fact it was the hose, decades old and never replaced. Since we do not loose ANY pressure for half a year. Main air is OK in the tank when valve is closed but air in the tubes drops in a few hours. No need for square o-rings anywhere but standard o-rings with big enough cross sections do it - BUT all faces must be smooth, no scratches or rust there so the o-ring has a chance to seal on them.
Vic
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Wed Aug 29, 2018 6:31 pm Post subject: Yak Air Valves |
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Rico,The Bobbin in the ER shut off valve will rust allowing it to leak.
Doc
Sent from my iPad
On Aug 29, 2018, at 4:01 PM, Rico Jaeger <rocknpilot(at)hotmail.com (rocknpilot(at)hotmail.com)> wrote:
| Quote: |
Greetings, Aviators and Aviatrixes!
As I continue my (endless) pursuits in identifying and rectifying my emergency air leak, about the only items remaining untouched are the master air valves. After liberating the front valve, I managed to open it up - despite it's best impressive efforts to remain intact. The only fix I can envision is lapping / re-seating the needle valve. My question is: Is it common for these to lose their sealing ability? It would seem to reason that they are used so little, (and built so robustly) that they shouldn't EVER wear out. Or is it because they're rarely used that they begin to loosen up? Am I missing part of the picture here? I don't see any seals or anything else that may be the issue...but despite no audible leak, emergency air is totally depleted within several hours. I replaced the bottle and sealed it TIGHTLY. The check-valve between the external fill point and the bottle checks out. Main air integrity is flawless.
Any ideas / guidance would be mucho appreciato!
Many thanx!
Rico Jaeger
915 S. 11th Ave.
Wausau, WI. 54401
715.529.7426
//
1969 Cessna 150J ^/---//-X
N61333 // Hangar #35 / AUW
//
1992 Yakovlev Yak 52 ^/---//-X
N21YK //
Hangar #21 / AUW
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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Viperdoc |
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Thu Aug 30, 2018 9:32 am Post subject: Yak Air Valves |
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True. Where did you find the square O rings.
Doc
Sent from my iPad
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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LawnDart
Joined: 05 Jun 2006
Posts: 64
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| Posted: Fri Aug 31, 2018 12:22 pm Post subject: Re: Yak Air Valves |
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I had a lifetime supply given to me by another Yak friend.
Basic dimensions are -
14.5mm OD
9.5mm ID
2.5mm height
I'd try Mcmaster if I were on the hunt.
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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